John,
Thank you for replying, for then the late 1980s info would
still stand, and go hand in hand with Mackenson,Ruttner,
and Tunisa/Punic bees, and other races looked at (mellifera
& Italian).

http://www.beesource.com/pov/lusby/bsmay1991.htm

This is a trait found in all races FWIW if looked for, and
again I have always considered it a necessary good trait.
Also to go back to a natural system of beekeeping without
treatments, you must accept what it naturally there, and
it's really not that hard to work with.

Sincerely,

Dee A. Lusby


 
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